It seemed in your comments, that you thought you needed to go to a site and plug in to a 30A plug to test your inverter. As long as you don't turn on a bunch of big draw things, just using your 20 amp to 30 amp AC plug adapter, which I expect you'd find thrown in the bottom of your power cord bay, in your driveway outlet will be just fine to provide enough amperage for this task. On a used rig like yours, I'd guess it might have also come with a 30A extension cord too. So pulling the full 15A or 20A available from your house plug in would be easy.
I've run my AC in this way, but found for instance that if I turned on the fridge too, while it's set to 120v, the 15 amp breaker lasted 30 seconds. Naturally, if you trip the house's breaker, you discover just how many other things were also running on that same breaker.
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Rick_99037
2005 Winnebago Sightseer 29R Class A
8.1 Workhorse - GM 4 speed
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